I knew of a breeder once whose ferrets (this was back in 1997-1998) were between 5-7 lbs..these were huge polydactyl sable boys who were also coming out as cryptorchids. The females were 2-3 lb burly ill-tempered dark sables. Thank heavens this breeder stopped several years ago. I had 2 these boys- they were sweet but had health issues before they were4 years old. The larger of the 2 boys had a huge brother who I did see at a Baltimore Ferret Show under the name "Mongo"... he won the "Ahnuld" class hands down... I love ferrets all sizes..size doesn't matter to me:) Marlene b. RFRL [Posted in FML 6884]